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t 20 March 1996 AGE-NC Project No 95-0130 Page 8 of 23 Imeasurable vacuum was observed at MW-3, approximately 35 feet east from VW-1 The vacuum applied at VW-1 and the induced vacuums at VW-2 and VW-3 were graphed versus distance on a semi-loganthmic scale(see Figure 10) However, a clear correlation of induced vacuum verses distance was not observed Vacuum data is included in Table 3 45 ANALYTICAL RESULTS OF VAPOR SAMPLES TPH-g was detected in vapor samples collected at concentrations ranging from 8,500 gg/l (elapsed time 8 5 hours) to 68,000 gg/l (elapsed time 4 5 hours) The analytical results are summarized in Table 4 The laboratory report (MAI Laboratory I D Nos 60653 through 60657) and chain-of- custody form are included in Appendix D I 5.0. QUARTERLY GROUND WATER MONITORING - JANUARY 1996 5 1 QUARTERLY GROUND WATER MONITORING AND SAMPLING On 29 January 1996, depths to ground water and total depths of monitoring wells MW-1 through MW-5 were measured to the nearest 0 01-foot utilizing a Solist water level meter Ground water surface elevations were plotted on a scaled site map, whereupon ground-water surface elevation contours were generated (Figure 11) During the January 1996 monitoring, ground water flow beneath the site was generally to the southeast at a gradient of about 0 0057, or approximately 30 feet per mile Ground water data is included in Table 2 After depths to ground water were measured, approximately 9 to 12 gallons of ground water (a minimum of three well volumes)were purged from MW-1 through MW-5 utilizing disposable bailers Temperature, pH and conductivity were measured at well volume intervals using an ICM model 52200 water analyzer Stabilization data and field logs are included in Appendix E Purge water was ' stored in 55-gallon drums stored on-site in an area inaccessible to the general public Monitoring wells MW-1 through MW-5 were purged and allowed to recover for a minimum of one hour prior to sample collection Ground water samples were collected from MW-1 through MW-5 utilizing a dedicated, disposable polyethylene bailer and new nylon rope Sufficient sample was collected from each well to fill three 40-nil EPA vials containing hydrochloric acid as a preservative Care was taken to ensure that no air bubbles were present in the VOAs after filling and capping Ground water sample containers were labeled with the well designation, date, time, and samplers initials The ground water samples were placed in an ice chest and chilled immediately following collection